diff options
Diffstat (limited to 'spec/support/matchers/be_indexed_by.rb')
| -rw-r--r-- | spec/support/matchers/be_indexed_by.rb | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/spec/support/matchers/be_indexed_by.rb b/spec/support/matchers/be_indexed_by.rb new file mode 100644 index 00000000000..ae955624ae9 --- /dev/null +++ b/spec/support/matchers/be_indexed_by.rb @@ -0,0 +1,26 @@ +# frozen_string_literal: true + +# Assert all the given foreign keys are indexed: +# +# ``` +# composite_foreign_keys = [['build_id', 'partition_id']] +# indexed_columns = [['build_id', 'name', 'partition_id'], ['partition_id', 'build_id', 'name']] +# expect(composite_foreign_keys).to be_indexed_by(indexed_columns) +# ``` +# +RSpec::Matchers.define :be_indexed_by do |indexed_columns| + match do |composite_foreign_keys| + composite_foreign_keys.all? do |composite_foreign_key| + indexed_columns.any? do |columns| + # for example, [build_id, partition_id] should be covered by indexes e.g. + # - [build_id, partition_id, name] + # - [partition_id, build_id, name] + # but not by [build_id, name, partition_id] + # therefore, we just need to take the first few columns (same length as composite key) + # e.g. [partition_id, build_id] of [partition_id, build_id, name] + # and compare with [build_id, partition_id] + (composite_foreign_key - columns.first(composite_foreign_key.length)).blank? + end + end + end +end |